Lost SNK File

Hi,

I do sharepoint web part development.

I lost the SNK file (somebody deleted) which was used to sign an assembly. Now i use a different SNK file and as a result i have a NEW Public Key Token different from the OLD assembly (its token was generated from the old snk file which i lost). When i try to deploy the web part which i signed with the NEW token, it is NOT overwriting the old web part. But i'm able to add this web part any new page. It just doesn't overwrite the old one.

I have around 200 sites which use this web part. Is there a way to overwrite it instead of doing Remove Old / Add New in 200 sites manually? I have the old DLL and CAB file and i know the old Token. But i don't have the SNK file which generated it. How can i sign the assembly with the SAME OLD Token so that i can overwrite the Web Part?

Thanks in advance.

-- DT